Multi-chamber ampoule for measured doses of liquids

Details Multi-chamber ampoule for measured doses of liquids Multi-chamber ampoule for measured doses of liquids

1999-08-19

2001-05-08

Walczak, David J. (Department: 3751)

Coating implements with material supply

Supply container and independent applicator

Tool supported out of communication with supply

C401S125000, C401S118000

Reexamination Certificate

active

06227736

ABSTRACT:

The invention relates to a multi-chamber ampoule for measured doses of liquids comprising an outer sleeve of elastic material which on the inside has a chamber which extends along an axis and is closed off by a bottom part at the lower end and a closing element which seals the outer sleeve at its head end, and a which has a micro brush which at its tip has an element capable of absorbing a liquid.
A multi-chamber ampoule of this type has been known from DE -G 92 02 654. In the case of the prior art ampoule, the chamber cavity is divided by the liquid filled in itself into two chambers. In the lower chamber, there is the measured dose and above the liquid, there is air.
There are, however, particular liquids which have to be filled in substantially under the exclusion of air. The disadvantage of the prior art ampoule is that because of the micro brush which extends into the chamber cavity, too much of the liquid has to be filled in in order to substantially drive out the air. A further disadvantage is that in case of excessive filling, either the shaft or the head portion of the micro brush are also wetted which, during draining or discharging, may lead to undesired dripping-off actions.
It is therefore the object of the present invention to provide a multi-chamber ampoule wherein in spite of the micro brush being present, the liquid may be filled in a measured dose substantially under the exclusion of air.
The object of the invention is solved by the features of claim
1
.
In accordance with the invention, there is provided a multi-chamber ampoule wherein the micro brush is housed separately from the measured dose of the liquid within a lower chamber of an outer sleeve. The micro brush is supported in a hollow and piston-like inner sleeve which forms a movable closing element for the outer sleeve with the lower chamber. The lower sleeve is encased as a piston slidable within the outer sleeve. The inner sleeve forms a second and upper chamber into which extends the micro brush with its tip.
It is essential that the wall of the inner sleeve includes radial bores which are sealed by the wall of the outer sleeve. By sliding in the micro brush, the piston-like inner sleeve is pressed into the liquid under it. Thereby, the outer elastic wall of the outer sleeve expands, or the wall of the inner sleeve is pressed towards the interior, respectively. In this way, a small wall gap between the walls is produced through which the liquid can flow through the bores into the chamber which contains the micro brush.
By completely lowering the inner sleeve, the total liquid flows from the first chamber of the outer sleeve into the second chamber of the inner sleeve. The expansion of the wall gap between the inner and the outer sleeve is amplified by a sealing lip in the lower area of the inner sleeve when the sealing lip has been moved out of the corresponding sealing groove.
Based on the invention, the liquid to be dosed may be stored under minimum air inclusion and separate from the micro brush. The micro brush itself constitutes the tool for lowering the inner sleeve.
The invention permits even the storing of a two-component liquid. One component is provided in the lower chamber of the outer sleeve which is closed by the inner sleeve. The other component is stored in the second chamber which includes the inner sleeve and which contains the micro brush.


REFERENCES:
patent: 4793476 (1988-12-01), Schrupp
patent: 5492426 (1996-02-01), Geuret
patent: 6082918 (2000-07-01), Gueret
patent: 92 02 654 U (1992-06-01), None
patent: 0 295 265 B1 (1987-03-01), None
patent: 0 332 487 A1 (1989-02-01), None
patent: 0 577 200 A1 (1993-06-01), None
patent: 0 688 516 A1 (1995-05-01), None
patent: 2182522 (1973-12-01), None
PCT Search Report from Appln. No. PCT/DE98/00430, dated Aug. 4, 1998.
Patent Abstracts of Japan, Publ. No. 08187121, Publ. date Jul. 23, 1996, “Applicator for Liquid Material Having Adhesion,” Inventor Yaita Shigeru.

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